Glass-polishing machine and holding chuck



@cfih l4 1924:. 151L828 c. w. DAKE GLASS POLISHING MACHINE AND HOLDING CHUCK Filed Oct. 2, 1922 2 Sheets-Sheet l l N VENTOR B gk ze S 79136056.

L A T TORNE Y C. W. DAKE GLASS POLISHING MACHINE AND HOLDING CHUCK Filed Oct. 2, 1922 2 Sheets-Sheet 2 INVENTOR B y 0720:?"ZQ3 Wflafia A TTORNEY alienated Cot. l

CHARLES W. DAKE, OF CHICAGO,

ILLINOIS, ASSIGNOR TO THE PYLE-NATIO'NAL COM- PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

GLASS-POLISHING MACHINE AND HOLDING CHUCK.

Application filed October 2, 1922. Serial No. 591,782.

To all whom it may concern:

Be it known that I, CHARLES W. DAKE, a citizen of the United States, residing at Chicago, in the county of Cook and State 5 of Illinois, have invented a certain new and useful Improvement in Glass-Polishing Machines and Holding Chucks, of which the following is a specification.

My invention relates to a polishing machine for polishing glass headlight reflector bowls and the like and is especially concerned with the chuck adapted to hold the bowl on the spindle and with the polishing pad used to perform the polishing act.

One object of my invention is to provide a new and improved form of support for a polishing pad adapted to polish the inside of headlight bowls. Another object is to provide a new and improved form of pneumatic chuck which will hold the bowl and permit polishing of the inside thereof. Other objects will appear from time to time in the specification.

My invention is illustrated more or less diagrammatically in the accompanying drawing wherein: Y Fig. 1 is a section through the chuck and the work;

Fig. 2 is an end elevation of the work showing the polishing element in place.

Like parts are indicated by like characters in the drawings.

A is a supporting base adapted to be mounted on legs such as A. A is a bearing bracket upwardly projecting from the base A and terminating in a bearing A carrying the spindle or shaft A". This spindle or shaft carries at its outer end a bowl-like chuck A which chuck terminates in an enlarged flange A having a packing member A thereon. The shaft A is apertured as at A so that air may be sucked through the shaft from the interiorof the chuck A I provide any suitable air exhaust or tails of which form no part of the present invention, for exhausting through the passage A the airtrapped between the chuck and'the reflector bowl contained therein.

glass. It is contained within the chuck A engaging adjacent its outer periphery the backing member A which makes an airtight joint. 18 is a plug closing the aperture B integument C which may through the air valve C to proper contour 80 suction means, not herein shown, the de- B is a reflector bowl, in this case made ofv in the reflector bowl. This plug is guided plug is necessary in this connection to conform or compensate for slight inaccuracies in the size of the bowl and also to permit expansion and contraction of the glass bowl without breaking and without dropping the bowl from the chuck.

C is a bracket extending upwardly from base A. Pivoted thereon and adapted to swing across into line with the chuck is a supporting arm C. This arm terminates in ayoke C in which is trunnioned the sleeve C C is a polishing pad mounted for rotation in the sleeve C and having a flexible, pneumatically extended polishing sheet or be inflated and pressure to cause the polishing surfaceto conform to thecontour of the work. C is a lever arm which may be weighted to increase the pressure of the polishing element.

It will be noted that the plug closing the opening 13 is on the side of the bowl re moved from the polishing pad. This permits the pad to extend clear through into the opening and insures that every portion of the reflector bowl may be polished, there be ing just suflicient clearance between the plug and the polishing pad to permit this.

No means are shown for driving or rotating the polishing pad other than its frictional engagement with the reflector .bowl. Experience shows that as the reflector bowl or work is rotated the pad will also rotate, and the fact that the pad and the work rotate about different-axes insures a proper polishing of the surface.

It will be evident that while I have shown in my drawing an operating device, stillmany changes might be made both in size,- shape and arrangement of parts without de parting materially from the spirit of my in- 105 vention, and I wish that my drawing be regarded as in a sense diagrammatic.

I claim: 1. A pneumatic chuck for holding reflector bowls and the like comprising a cup 1110 spring is strong enough to insure a 60 adapted to enclose the work, a packing element interposed between the mouth of the cup and the work, yielding means carried by the cup for closmg an aperture in the work, a fluid conductor element adapted to be connected to an exhausting means, and having a fluid passage connecting with the cup.

2. 'A pneumatic chuck for holding reflector bowls and the like comprising a cup adapted to enclose the work, a packing element interposed between the mouth of the cup and the,work, yielding means carried by the cup for closing an aperture in the work and a fluid conductor element adapted to be connected to an exhausting means, and having a fluid passage connecting with the cup, the aperture closing means comprising a plug, a guide member therefor and a spring adapted to thrust the plug outwardly against the work. V

3. A polishing machine for glass bowls and the like comprising a cup adapted to enclose a portion of the bowl, means for closing an aperture in the bowl, and a fluid conductor element adapted to be connected to an exhausting means, and having a fluid passage connecting with the cup, the aperture closing means being removed from the inner surface of the bowl, anda polishing element adapted to project into the bowl to polish it.

4. A polishing machine for glass bowls and the like comprising a cup adapted to enclose a portion of the bowl, means for closing an aperture in the 'bowl and a fluid conductor element adapted to lie-connected to an exhaustingmeans, and having a fluid passage connecting with the cup, the aperture closing means being removed from the inner surface of the bowl, and a polishing element adapted to project into the bowl and 'polish it, the polishing element extend-- ing into the aperture in the bowl but out of contact with the closing means.

5. A reflector bowl grinding machine comprising a rotating shaft, a cup carried thereby adapted to-contain the bowl and means for holding the bowl in position therein, a bracket extending upwardly and outwardly adjacent the cup, an arm pivoted thereupon,

to rotate about an axis inclined to, the axis lar to the axis of rotation of the arm, a polishing pad pivoted in said bearing to rotate about an axis perpendicular to the axis of rotation of said bearing, and adapted to rotate as a result of the rotation of the bowl,

with which it is engaged, the arm bein positioned and proportioned to hold sai pad against said bowl eccentrically of the axis of rotation of the bowl.

6. A chuck for holding headlight reflector blanks and the like comprising a bowlshaped member, a packing ring about the mouth thereof on the inside adapted to engage the work, a Valve'plunger adapted to engage and close a centralaperture in the work, a guide rod for said plunger, yielding means for holding the plunger against the work and a fluid conductor element adapted to be connected to an exhausting means, and having'a fluid passage connecting with the cup.

7. A chuck for headlight reflector bowls comprising a cup adapted to enclose the bowl, a packing ring interposed between the mouth of the cup and the body of the bowl, a spring-held valve adapted to yieldingly engage the bowl and close an opening therethrough, a spring therefor, a fluid conductor adapted to be connected to an exhausting means, and having a fluid passage connecting'with the cup, the tension on the valve holding spring being suflicient to prevent opening of the valve by atmospheric pressure while permitting expansion and contraction of the bowl without unseating the valve.

8. A pneumatic chuck for holding reflector bowls and the like, comprising a cup adapted to inclose the work, yielding means carried by the cup for closing an aperture in the work, and a fluid conductor element adapted to be connected to an exhausting means,iand having a fluid passage connecting with the cup.

Signed at Chicago, county of Cook and State of Illinois, this 28th day of September,

CHARLES w. DAKE. 

